The invention belongs to the technical field of interior design. An interior design method and system based on user interest preference are disclosed. The system comprises a user mobile terminal, a server, a designer mobile terminal, a cloud database, a picture upload module, a personal center module, a 3D solution experience module, a management center module, an algorithm processor, a data processor, a designer personal center module, a 3D object editor, and a 3D solution generator. The mobile client is wirelessly connected to the server, the designer mobile end is wirelessly connected to the server, and the cloud database is wirelessly connected to the server. The invention inspects the user attribute, the attribute of the browsed content and the operation behavior of the user in the system, effectively understands the interest preference of the user, and realizes the automatic recommendation of the design scheme, and the user and the designer can participate in the scheme design simultaneously online, reduces the communication cost, and improves the communication efficiency between the designer and the customer.